Stocks trading ex-dividend drag FTSE 100 lower in thin trading

July 4 (Reuters) - London's main index edged lower on Thursday, led by steep falls in shares of IAG and Coca Cola HBC, which traded ex-dividend, while several investors stayed on the sidelines in lieu of a U.S. market holiday.

The FTSE 100 inched 0.1% lower, but was still hovering around a 10-month high and the FTSE 250 was roughly trading flat by 0708 GMT.

British Airways owner International Consolidated Airlines Group skidded 7% and was on course for its worst day since June 2016, as the stock traded without a dividend entitlement.